Hollywood superstar Tom Cruise had a custom-built luxury bus made for him using Scientology “slave labor,” according to the church’s former Inspector General, Mark Rathbun, who also claims to have top-secret internal e-mails proving so.

According to one email Rathbun says was written by Yvonne Gonzalves, the Director of Vehicles of the Sea Org branch, the super-secret organization within the Church which was responsible for building the trailer-style bus, staffers put in nearly 9,000 man hours into production of the vehicle.

The FBI is reportedly investigating alleged human trafficking at the church and have interviewed several high-ranking Sea Org defectors, over the past two years, about what they claim are abusive and coercive practices within the church.

The church has emphatically denied that any of its staff were ever mistreated.

In the email released by Rathbun, who the church insists is an anti-Scientologist devoid of credibility, Gonzalves wrote that she had made “the owner and head of production very aware of who they are making the coach for” after production of the Silver Screen fell worryingly behind schedule.

In an effort to speed up the process, Gonzalves even suggested having “Tommy D [head of LA’s Scientology Celebrity Center] call and tell them that Mr. Cruise is expecting the coach on site when he starts to shoot on July 27th and that they had better deliver.”

Cruise was shooting Mission Impossible 3 and War of the Worlds around that time.

The emails provide an inside look at the Church of Scientology and its connections to Hollywood celebrities, none bigger than Cruise, who is considered one of the organization’s highest-profile public figures and an effective evangelists.

John Brosseau, another former Church of Scientology member, has claimed he was put to work by Miscavige to customize Cruise’s SUV, two motorcycles and a building.

In response to the claims, Scientology spokesman Tommy Davis said the church “has never been advised of any government investigation.”

“Whatever small economic benefit Mr. Cruise may have received from the assistance of church staff pales in comparison to the benefits the church has received from Mr. Cruise’s many years of volunteer efforts for the church,” Davis told The New Yorker.